FAIR VALUE OF FINANCIAL INSTRUMENTS, QUANTITATIVE INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique(s)	Discounted Cash Flows
Impaired Loans [Member] \| Discounted Cash Flows [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	4,882
Probability of Default (in hundredths)	0.00%
Impaired Loans [Member] \| Discounted Cash Flows [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Change in interest rates (in hundredths)	0.00%
Impaired Loans [Member] \| Discounted Cash Flows [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Change in interest rates (in hundredths)	7.00%
Impaired Loans [Member] \| Appraised Collateral Values [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	4,954
Impaired Loans [Member] \| Appraised Collateral Values [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal	0.00%
Selling costs (in hundredths)	0.00%
Holding period	0 months
Impaired Loans [Member] \| Appraised Collateral Values [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal	20.00%
Selling costs (in hundredths)	10.00%
Holding period	18 months
Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique(s)	Appraised Collateral Values
Other Real Estate Owned [Member] \| Appraised Collateral Values [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	616
Other Real Estate Owned [Member] \| Appraised Collateral Values [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal	0.00%
Selling costs (in hundredths)	6.00%
Holding period	0 months
Other Real Estate Owned [Member] \| Appraised Collateral Values [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal	20.00%
Selling costs (in hundredths)	10.00%
Holding period	18 months

Percentage of change in interest rates, used as an input to measure fair value.

No definition available.

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Namespace Prefix:	czfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Holding period, used as an input to measure fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	czfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of selling costs, used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	czfs_FairValueInputsSellingCosts
Namespace Prefix:	czfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Period Type:	duration

- Definition

Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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